# Scrapy settings for dangdang project
#
# For simplicity, this file contains only settings considered important or
# commonly used. You can find more settings consulting the documentation:
#
#     https://docs.scrapy.org/en/latest/topics/settings.html
#     https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#     https://docs.scrapy.org/en/latest/topics/spider-middleware.html

BOT_NAME = "dangdang"

SPIDER_MODULES = ["dangdang.spiders"]
NEWSPIDER_MODULE = "dangdang.spiders"


# Crawl responsibly by identifying yourself (and your website) on the user-agent
#USER_AGENT = "dangdang (+http://www.yourdomain.com)"

# Obey robots.txt rules
# ROBOTSTXT_OBEY = True

# Configure maximum concurrent requests performed by Scrapy (default: 16)
# 增加并发请求数
# CONCURRENT_REQUESTS = 100


# 增加并发请求数
# CONCURRENT_REQUESTS = 100  # 默认是 16，可以根据系统性能调整

# 增加 Twisted 线程池大小
# REACTOR_THREADPOOL_MAXSIZE = 20  # 默认是 10，可以根据 CPU 核心数调整

# 禁用重试和重定向，减少不必要的请求
# RETRY_ENABLED = False
# REDIRECT_ENABLED = False

# Configure a delay for requests for the same website (default: 0)
# See https://docs.scrapy.org/en/latest/topics/settings.html#download-delay
# See also autothrottle settings and docs
#DOWNLOAD_DELAY = 3
# The download delay setting will honor only one of:
#CONCURRENT_REQUESTS_PER_DOMAIN = 16
#CONCURRENT_REQUESTS_PER_IP = 16

# Disable cookies (enabled by default)
#COOKIES_ENABLED = False

# Disable Telnet Console (enabled by default)
#TELNETCONSOLE_ENABLED = False

# Override the default request headers:
#DEFAULT_REQUEST_HEADERS = {
#    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8",
#    "Accept-Language": "en",
#}

# Enable or disable spider middlewares
# See https://docs.scrapy.org/en/latest/topics/spider-middleware.html
#SPIDER_MIDDLEWARES = {
#    "dangdang.middlewares.DangdangSpiderMiddleware": 543,
#}

# Enable or disable downloader middlewares
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html
#DOWNLOADER_MIDDLEWARES = {
#    "dangdang.middlewares.DangdangDownloaderMiddleware": 543,
#}

# Enable or disable extensions
# See https://docs.scrapy.org/en/latest/topics/extensions.html
#EXTENSIONS = {
#    "scrapy.extensions.telnet.TelnetConsole": None,
#}

# Configure item pipelines
# See https://docs.scrapy.org/en/latest/topics/item-pipeline.html
# 管道可以有很多个 那么管道是有优先级的 优先级的范国是1到1000 值越小优先级越高
ITEM_PIPELINES = {
   "dangdang.pipelines.DangdangPipeline": 300,
   "dangdang.pipelines.DangdangDownloadPipeline": 301,
   "dangdang.pipelines.DangdangToMysqlPipeline": 302,
}

# Enable and configure the AutoThrottle extension (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/autothrottle.html
#AUTOTHROTTLE_ENABLED = True
# The initial download delay
#AUTOTHROTTLE_START_DELAY = 5
# The maximum download delay to be set in case of high latencies
#AUTOTHROTTLE_MAX_DELAY = 60
# The average number of requests Scrapy should be sending in parallel to
# each remote server
#AUTOTHROTTLE_TARGET_CONCURRENCY = 1.0
# Enable showing throttling stats for every response received:
#AUTOTHROTTLE_DEBUG = False

# Enable and configure HTTP caching (disabled by default)
# See https://docs.scrapy.org/en/latest/topics/downloader-middleware.html#httpcache-middleware-settings
#HTTPCACHE_ENABLED = True
#HTTPCACHE_EXPIRATION_SECS = 0
#HTTPCACHE_DIR = "httpcache"
#HTTPCACHE_IGNORE_HTTP_CODES = []
#HTTPCACHE_STORAGE = "scrapy.extensions.httpcache.FilesystemCacheStorage"

# Set settings whose default value is deprecated to a future-proof value
TWISTED_REACTOR = "twisted.internet.asyncioreactor.AsyncioSelectorReactor"
FEED_EXPORT_ENCODING = "utf-8"

# 日志级别
LOG_LEVEL = "INFO"




# MySQL 数据库配置
MYSQL_HOST = 'localhost'  # 数据库地址
MYSQL_PORT = 3306         # 数据库端口
MYSQL_USER = 'root'       # 数据库用户名
MYSQL_PASSWORD = 'root'   # 数据库密码
MYSQL_DATABASE = 'test'   # 数据库名称
DB_CHARSET = 'utf8mb4' #编码
MYSQL_TABLE='book_dangdang' # 表
